122 lines
3.0 KiB
C++
122 lines
3.0 KiB
C++
/* This code is public-domain - it is based on libcrypt
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* placed in the public domain by Wei Dai and other contributors.
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*/
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#include "sha1.hpp"
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#define SHA1_K0 0x5a827999
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#define SHA1_K20 0x6ed9eba1
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#define SHA1_K40 0x8f1bbcdc
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#define SHA1_K60 0xca62c1d6
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const uint8_t sha1InitState[] = {
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0x01,0x23,0x45,0x67, // H0
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0x89,0xab,0xcd,0xef, // H1
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0xfe,0xdc,0xba,0x98, // H2
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0x76,0x54,0x32,0x10, // H3
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0xf0,0xe1,0xd2,0xc3 // H4
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};
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void sha1_init(sha1nfo *s) {
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memcpy(s->state.b,sha1InitState,HASH_LENGTH);
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s->byteCount = 0;
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s->bufferOffset = 0;
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}
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uint32_t sha1_rol32(uint32_t number, uint8_t bits) {
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return ((number << bits) | (number >> (32-bits)));
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}
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void sha1_hashBlock(sha1nfo *s) {
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uint8_t i;
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uint32_t a,b,c,d,e,t;
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a=s->state.w[0];
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b=s->state.w[1];
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c=s->state.w[2];
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d=s->state.w[3];
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e=s->state.w[4];
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for (i=0; i<80; i++) {
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if (i>=16) {
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t = s->buffer.w[(i+13)&15] ^ s->buffer.w[(i+8)&15] ^ s->buffer.w[(i+2)&15] ^ s->buffer.w[i&15];
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s->buffer.w[i&15] = sha1_rol32(t,1);
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}
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if (i<20) {
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t = (d ^ (b & (c ^ d))) + SHA1_K0;
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} else if (i<40) {
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t = (b ^ c ^ d) + SHA1_K20;
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} else if (i<60) {
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t = ((b & c) | (d & (b | c))) + SHA1_K40;
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} else {
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t = (b ^ c ^ d) + SHA1_K60;
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}
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t+=sha1_rol32(a,5) + e + s->buffer.w[i&15];
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e=d;
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d=c;
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c=sha1_rol32(b,30);
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b=a;
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a=t;
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}
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s->state.w[0] += a;
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s->state.w[1] += b;
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s->state.w[2] += c;
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s->state.w[3] += d;
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s->state.w[4] += e;
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}
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void sha1_addUncounted(sha1nfo *s, uint8_t data) {
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s->buffer.b[s->bufferOffset ^ 3] = data;
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s->bufferOffset++;
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if (s->bufferOffset == BLOCK_LENGTH) {
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sha1_hashBlock(s);
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s->bufferOffset = 0;
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}
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}
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void sha1_writebyte(sha1nfo *s, uint8_t data) {
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++s->byteCount;
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sha1_addUncounted(s, data);
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}
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void sha1_write(sha1nfo *s, const char *data, size_t len) {
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for (;len--;) sha1_writebyte(s, (uint8_t) *data++);
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}
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void sha1_pad(sha1nfo *s) {
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// Implement SHA-1 padding (fips180-2 §5.1.1)
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// Pad with 0x80 followed by 0x00 until the end of the block
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sha1_addUncounted(s, 0x80);
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while (s->bufferOffset != 56) sha1_addUncounted(s, 0x00);
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// Append length in the last 8 bytes
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sha1_addUncounted(s, 0); // We're only using 32 bit lengths
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sha1_addUncounted(s, 0); // But SHA-1 supports 64 bit lengths
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sha1_addUncounted(s, 0); // So zero pad the top bits
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sha1_addUncounted(s, s->byteCount >> 29); // Shifting to multiply by 8
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sha1_addUncounted(s, s->byteCount >> 21); // as SHA-1 supports bitstreams as well as
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sha1_addUncounted(s, s->byteCount >> 13); // byte.
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sha1_addUncounted(s, s->byteCount >> 5);
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sha1_addUncounted(s, s->byteCount << 3);
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}
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uint8_t* sha1_result(sha1nfo *s) {
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int i;
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// Pad to complete the last block
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sha1_pad(s);
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// Swap byte order back
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for (i=0; i<5; i++) {
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uint32_t a,b;
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a=s->state.w[i];
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b=a<<24;
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b|=(a<<8) & 0x00ff0000;
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b|=(a>>8) & 0x0000ff00;
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b|=a>>24;
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s->state.w[i]=b;
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}
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// Return pointer to hash (20 characters)
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return s->state.b;
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}
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